CAT 205-4138 Bearing – Cone(Debris Resistant)

CAT 205-4138 is a Caterpillar genuine tapered roller bearing inner ring (cone ring), suitable for the travel motor, gearbox, or lifting mechanism tapered roller bearing assembly of Cat 320D/323D excavators, 950H loaders, etc. It is used in conjunction with the outer ring (cup) to withstand radial and bidirectional axial loads. The following is professional structured information:

Core Technical Parameters (Professional Version)

Item Details
Basic Attributes
Model 205-4138
Bearing inner ring (tapered roller bearing cone ring), suitable for Cat tapered roller bearing assemblies, material is 52100 high carbon chromium bearing steel (vacuum degassed), integrally hardened (HRC 60-64, hardened layer 1.5-2.0 mm), inner diameter φ65 mm, outer diameter φ90 mm, width 28 mm, single weight approximately 0.78 kg, compatible bearing outer ring model 205-4139, rated dynamic load 180 kN, rated static load 220 kN, operating temperature -30℃ to +120℃, compatible with NLGI 2 lithium-based grease (with EP additive), corrosion resistance IP65, with tapered raceway and locking structure, interference fit with shaft (0.015-0.025 mm)

Key Dimensions: Inner diameter tolerance +0.008/-0.005 mm, outer diameter tolerance +0.018/-0.012 mm, width tolerance ±0.12 mm, raceway surface roughness Ra≤0.4 μm, inner hole surface Ra≤0.8 μm, locking width 5 mm, locking height 3 mm, chamfer at both ends 1.2×45°, end face runout ≤0.03 mm, coaxiality ≤0.02 mm

Material and Process: 52100 bearing steel, forged and precision machined + ground, integrally quenched + Low-temperature tempering ensures dimensional stability; ultra-precision grinding of the raceway enhances contact fatigue strength; tensile strength ≥1800 MPa, yield strength ≥1500 MPa, retained austenite content ≤5%; inner ring-roller contact angle 12°; suitable for single-row tapered roller bearing assemblies.

Compatible machine types: Cat 320D/323D excavator slewing bearing inner ring, 950H/966H loader boom lifting cylinder bearing inner ring, D6N bulldozer steering clutch bearing inner ring; suitable for tapered roller bearing assemblies; common matching outer ring models 205-4139; suitable for heavy-duty transmission parts with a shaft diameter of φ65 mm.

Assembly fit: interference fit with shaft (0.015-0.025 mm); after installation, the inner ring-roller clearance is 0.02-0.04 mm; the inner ring end face is flush with the bearing assembly end face (deviation ≤0.1 mm). (mm) During installation, a dedicated bearing heater (80-100℃) must be used to heat the bearing before heat fitting. Cold installation by force is strictly prohibited.

Installation and Maintenance Points:

Before installation, clean the inner ring, journal, and outer ring of the bearing. Check for cracks, deformation, and raceway peeling. Heat the inner ring to 80-100℃ using the bearing heater before heat fitting it to the journal locating surface, ensuring it is in place without looseness.

After installation, check that the bearing rotates freely without jamming. Run it under no-load for 20 minutes, monitoring the temperature to ≤80℃. Check every 1500 hours. If raceway wear >0.15 mm or pitting or cracks appear, immediately replace the inner ring and its matching rollers and outer ring.

The initial grease filling amount is 1/3 of the bearing assembly volume. Replenish grease every 1000 hours. In dusty/humid conditions, shorten this to 500 hours. Avoid mixing different types of grease, which can lead to lubrication failure.